First tests os a Micro-TCA-Based downconverter electronic for 5GHz higher order modes in third harmonic accelerating cavities at the XFEL

Beam excited higher order modes (HOM) in 3.9GHz accelerating cavities at the European XFEL are planned to be used for beam position monitoring. The specifications of the monitors have been defined during an extensive study on the 3.9GHz module at FLASH. Selected HOMs for precision measurement are located around 5440MHz and 9040MHz. An electronics developed by FNAL has been recently installed at FLASH and provides a basis for the XFEL electronics. The paper will present the design and first test of the hardware for the Micro TCA standard used for the XFEL. The hardware consists of three different Rear Transition Modules (RTM), two four channel down converter RTMs (5GHz and 9GHz) and a third RTM with two phase locked loop synthesizers on board for LO generation. Presently the 5GHz and the PLL RTMs are under construction. The first measurements with these cards will be presented.